EP1076221B1 - Un robot avec système de jauge pour déterminer des mesures de données à 3 dimensions - Google Patents
Un robot avec système de jauge pour déterminer des mesures de données à 3 dimensions Download PDFInfo
- Publication number
- EP1076221B1 EP1076221B1 EP00117126A EP00117126A EP1076221B1 EP 1076221 B1 EP1076221 B1 EP 1076221B1 EP 00117126 A EP00117126 A EP 00117126A EP 00117126 A EP00117126 A EP 00117126A EP 1076221 B1 EP1076221 B1 EP 1076221B1
- Authority
- EP
- European Patent Office
- Prior art keywords
- robot
- contact sensor
- position data
- image data
- sensor
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Expired - Lifetime
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Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
- G01S17/02—Systems using the reflection of electromagnetic waves other than radio waves
- G01S17/06—Systems determining position data of a target
- G01S17/42—Simultaneous measurement of distance and other co-ordinates
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
- G01S17/88—Lidar systems specially adapted for specific applications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01S—RADIO DIRECTION-FINDING; RADIO NAVIGATION; DETERMINING DISTANCE OR VELOCITY BY USE OF RADIO WAVES; LOCATING OR PRESENCE-DETECTING BY USE OF THE REFLECTION OR RERADIATION OF RADIO WAVES; ANALOGOUS ARRANGEMENTS USING OTHER WAVES
- G01S17/00—Systems using the reflection or reradiation of electromagnetic waves other than radio waves, e.g. lidar systems
- G01S17/88—Lidar systems specially adapted for specific applications
- G01S17/89—Lidar systems specially adapted for specific applications for mapping or imaging
Definitions
- the present invention relates generally to non-contact gauging systems and, more particularly, a robot-based gauging system and method for determining three-dimensional measurement data of an object.
- non-contact sensors such as optical sensors
- the sensor may be moved in relation to the workpiece. Therefore, it is important to know the exact location and orientation of the moving item (either the sensor or the workpiece) each time the sensor acquires image data of the workpiece. This tends to be fairly straightforward for accurate motion devices (e.g., a CMM), since the reported position reflects the actual position of the device.
- the motion controller of an accurate motion device may include various compensation factors that get applied to the motion control to ensure the commanded position matches the actual position of the device.
- the high cost associated with these types of motion devices is prohibitive to them being used in a typical manufacturing environment.
- a conventional industrial robot as the motion device in the gauging system.
- the robot can be used to move the sensor in relation to the workpiece.
- Industrial robots are well suited to perform complex motion sequences which are customized for the workpiece.
- many standard industrial tools are available which allow the programming of the motion sequences to be performed off-line and subsequently downloaded to the robot controller.
- Robot controllers generally utilize ideal kinematic models when instructing robot motion.
- the physical characteristics of the robot arm vary slightly from the ideal model, and thus the actual movement of the robot arm varies slightly from the commanded motion sequence. Furthermore, these physical characteristics are likely to change as the robot is subject to wear and thermal changes.
- Most robot controllers are not equipped with any additional means for translating and/or correcting the reported position into an actual position of the robot arm.
- conventional industrial robots have not heretofore been used in non-contact gauging systems and other highly accurate manufacturing workstation applications.
- WO 97/05449 discloses a scanning apparatus which comprises a multiply jointed arm with an arm control unit and a probe.
- the control unit includes a processing unit which is coupled to a computer.
- the object is scanned to capture data from a plurality of points on the surface of the object so that the scanner may capture data from two or more points simultaneously.
- the signal generated is structured light in the form of stripe or area from illumination sources such as a laser diode or bulbs which enable data for the position and color of the surface to be determined.
- a robot system for recognizing three-dimensional shapes which comprises a slit-light detector which is constructed of a light projector for projecting light so as to form a slit-light on an object to be handled and an image detector for detecting an image of the light-section wave form.
- the image detector is mounted on an operating member of the robot. The light is scanned, and the slit-light detector detects a range data, on the basis of which a position, posture, inclination etc. of the object in three-dimensional shape are detected, so that the robot can handle the object.
- a structured light scanner for 3-D robot vision is known.
- the system uses a 4 x 3 transformation matrix that converts points in the image plane into their corresponding 3D world coordinates.
- Calibration of the scanner includes computing the coefficient of the matrix by showing to the system a set of lines generated by suitable object edges. A flat trapezoidal object that is shaped in such a manner that no two edges of the top-surface are parallel to each other, is scanned to obtain a calibration using different calibration steps.
- an object of the invention to disclose a robot-based gauging system for determining three-dimensional measurement data for the surface of an object that allows for a very precise three-dimensional measurement of an object.
- the gauging system includes a robot having at least one movable member and a robot controller for controlling the movement of the movable member in relation to the surface of an object.
- a non-contact sensor is coupled to the movable member of the robot for capturing image data representative of the surface of the object.
- a position reporting device configured as a photogrammetric measurement system is used to report position data representative of the position of the non-contact sensor.
- a synch signal generator is used to generate and transmit a synch signal to each of the non-contact sensor and the position reporting device, wherein the non-contact sensor reports image data in response to the synch signal and the position reporting device reports position data in response to the synch signal.
- the gauging system further includes a vision system adapted to retrieve image data from the non-contact sensor and position data from the position reporting device.
- a vision system adapted to retrieve image data from the non-contact sensor and position data from the position reporting device.
- the vision system must be able to synchronize the image data with the position data.
- a memory storage space is used to store position data so that the vision system can synchronize the image data with the position data. In this way, the robot-based gauging system of the present invention is able to quickly and accurately determine three-dimensional measurement data for the object.
- FIG. 1 An exemplary robot-based gauging system of the type commonly employed in vehicle assembly lines or other automotive applications is shown in Figure 1 .
- a robot-based gauging system 10 is often used for ensuring that each vehicle body component is assembled within predefined tolerances.
- the robot-based gauging system 10 may measure the door of a vehicle body 12.
- the invention is not limited to automotive applications, an exemplary use for the robot-based gauging system 10 would be in an automotive assembly plant.
- a single non-contact sensor 20 is mounted on a robot arm 22 of a robot 24.
- the sensor 20 in the present embodiment is a contour sensor which is only capable of two dimensional (2D) measurements.
- the sensor 20 emits a planar structured light pattern.
- a characteristic reflected light pattern is achieved which can be detected by the sensor 20.
- the contour sensor can measure (through triangulation) in two dimensions a plane on the reflecting workpiece.
- Communication cables 28 connect the sensor 20 and the controller of the robot 24 to a machine vision computer 30 which includes a CRT (cathode ray tube) display 32.
- a printer 34 is optionally provided with a typical machine vision computer.
- the robot arm 22 is movable to a plurality of positions for measuring the periphery of a workpiece (e.g., a door).
- the sensor 20 can continuously acquire data as the robot arm 22 traverses the surface of a workpiece.
- three-dimensional measurement data for the workpiece may be acquired by "scanning" or continuously moving the two-dimensional measurement sensor in relation to the workpiece.
- the gauging system 10 is also able to report the three-dimensional measurement data with respect to a predetermined reference frame or coordinate system associated, for example, with the vehicle body 12 to be measured, or with respect to an external reference frame associated with the gauging station.
- Figure 2 illustrates the basic components associated with the robot-based gauging system 10.
- a non-contact sensor 20 is affixed to the end of a robot arm 22 which in turn is connected to a robot controller 38.
- the robot controller 38 is operative to control the movement of the robot arm 22 in relation to the surface of an object to be gauged by the system, and the non-contact sensor 20 is operative to capture image data representative of a portion of the surface of the object.
- a position reporting device 26 is used to report position data representative of the position of the non-contact sensor 20.
- the non-contact sensor 20 and the position reporting device 26 are each in turn electrically connected to a vision system 40 residing on the machine vision computer 30.
- the position of the sensor 20 can be reported either directly or indirectly by the position reporting device 26.
- the actual position of the sensor 20 is reported by a photogrammetry system to the vision system 40
- the position of the sensor 20 is deduced from the position of the robot arm 22 which is reported (e.g., by the robot controller) to the vision system 40.
- the vision system 40 synchronizes the image data with the position data, thereby determining three-dimensional measurement data for the workpiece.
- the vision system 40 includes a synchronization module 42 and a timing signal generator 44.
- the vision system 40 uses a timing signal or a hardware latch signal which is generated by the timing signal generator 44.
- the timing signal is then simultaneously transmitted to the sensor 20 and the position reporting device 26.
- the sensor 20 records image data for the workpiece and the position reporting device 26 records current position data for the non-contact sensor 20.
- Image data and position data can then be requested by and delivered to the vision system 40.
- the vision system 40 acquires the measurement data needed to construct a contour line representative of the surface of the workpiece. It should be noted that the vision system does not rely on the sensor motion being at a constant velocity in relation to the workpiece. On the contrary, it is envisioned that the velocity of the sensor may vary as it scans the workpiece.
- FIG. 3 A gauging system not covered by the invention which utilizes the indirect approach to acquire position data is shown in Figure 3 .
- the indirect approach deduces the position of the sensor from the position of the robot arm 22. To do so, the position data is reported by the robot controller 38 to the vision system 40. However, as previously described, the actual position of the robot arm varies from the commanded position data as reported by the robot controller 38.
- the vision system 40 further incorporates a kinematic correction module 50 which applies a real time kinematic correction factor to the reported position data received from the robot controller 38.
- the DynaCal Robot Cell Calibration System developed by Dynalog, Inc. of Bloomfield Hills, Michigan may be adapted to serve as the kinematic correction module 50.
- the kinematic correction module 50 incorporates a procedure that determines physical deviations between the actual robot and its corresponding ideal model. These deviations are stored as robot-specific parameters.
- the kinematic correction module 50 receives the reported position data from the robot controller 38. Since the robot controller 38 is unaware of the robot's physical deviations, the reported position data is based on the ideal model.
- the kinematic correction module 50 translates the reported position data into actual position data by using the robot-specific parameters.
- the actual position data of the robot arm is transformed to position data for the sensor.
- the sensor position data is then provided to the synchronization module 42.
- the non-contact sensor 20 is preferably a Tricam non-contact sensor which is manufactured by Perceptron, Inc. of Madison, Michigan. While the following description is provided with reference to the Tricam non-contact sensor, it is readily understood that the explanation is applicable to other non-contact sensors.
- the timing signal generator 44 is a software module that resides on a circuit board which can easily be incorporated into the machine vision computer 30. Moreover, the timing signal generator 44 is associated with the sensor 20, such that the hardware latch signal is generated internal to the sensor 20. In operation, the sensor generates a hardware latch signal each time it acquires image data. The sensor 20 is further configured to simultaneously transmit the hardware latch signal to the robot controller 38.
- the Tricam non-contact sensor may support an external input that allows for image acquisition to be initiated by an hardware latch signal which is generated external to the sensor 20.
- the timing signal generator 44 may be associated with some external computing device (e.g., the robot controller).
- the Tricam non-contact sensor In order to "scan" the sensor in relation to the workpiece, image data must be captured at a rate which allows for the continuous motion of the sensor.
- the Tricam non-contact sensor In a continuous operation mode, the Tricam non-contact sensor is limited by the frame rate of its camera which operates at a frequency of 30 Hz.
- the image data reported by the sensor 20 lags in time behind the position data reported by the robot controller 38 by two frame times (e.g., 2/30 second). Accordingly, the image data received from the sensor 20 requires synchronization with the position data received from the robot controller 38.
- the present invention synchronizes the image data with the position data as shown in Figure 4 .
- a memory space internal to the vision system is used to store and process position data received from the robot controller 38.
- the memory space is further defined into an image memory space for storing image data and at least three positional memory spaces for storing position data.
- a first timing signal causes the vision system to retrieve position data(t 0 ) from the robot controller which is in turn stored in a first memory space 62.
- the vision system copies the position data(t 0 ) in the first memory space 62 to a second memory space 64 and then retrieves the next available position data(t 1 ) into the first memory space 62.
- a third timing signal causes the position data(t 0 ) in the second memory space 64 to be copied to a third memory space 66, the position data(t 1 ) in the first memory space 62 to be copied to the second memory space 64, and new position data(t 2 ) to be retrieved into the first memory space 62.
- the vision system 40 is able to store the three most recent sets of position data received from the robot controller 38
- image data(t 0 ) corresponding to the initial position data(t 0 ) is available from the sensor to the vision system.
- this image data is read into the image memory space 68 of the vision system.
- the vision system is able to accurately construct measurement data for the workpiece. For each additional timing signal, this synchronization process is repeated by the vision system.
- a timing signal tells the vision system to retrieve the current image data from the sensor and to retrieve the current position data from the robot controller.
- the first instance of this timing signal does not occur until after the first set of image data has been processed and is available to the vision system. Since there are two frame times between the laser strobe and this first timing signal, the available position data no longer matches the available image data. In other words, the position data which is retreived in response to the first timing signal corresponds to the image data retrieved in response to the third timing signal. As a result, the first two sets of image data are discarded, and synchronization begins with the third set of image data.
- the position of the sensor is directly reported to the vision system 40 by an independent measurement system as shown in Figure 5 .
- one or more photogrammetric cameras are positioned at convenient vantage points in the gauging station.
- Each photogrammetric camera operates under conventional photogrammetry techniques. That is, the photogrammetric camera emits a burst of quasi-monochromatic light and its camera detects the reflection of this light.
- retroreflective markers may be placed on the surface of the non-contact sensor 20. When the markers are illuminated by infrared light from a camera, light is reflected by the markers, as bright light spots, back to a motion capture unit within the camera. The light spots are analyzed, such that their position and sizes are calculated by the camera, thereby determining the position of the markers. It is envisioned that the photogrammtric camera may operate using other conventional operational techniques, including but not limited to tracking of luminous targets.
- the photogrammetry system will provide an accurate determination of the position of the sensor. In this way, the actual position of the sensor is reported to the vision system 40. It should be noted that since the photogrammetry system 80 reports the actual position of the sensor, according to the invention there is no need for the kinematic correction module.
- the robot-based gauging system 10 can otherwise operate as previously discussed in relation to Figures 1-4 .
- the present invention provides a significant advance in the art of robot-based gauging systems.
- the invention accurately determines three-dimensional measurement data for a workpiece through the use of a synchronized scanning process and without the need for expensive sensor positioning devices, such as CMMs.
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- Physics & Mathematics (AREA)
- Engineering & Computer Science (AREA)
- Electromagnetism (AREA)
- Computer Networks & Wireless Communication (AREA)
- General Physics & Mathematics (AREA)
- Radar, Positioning & Navigation (AREA)
- Remote Sensing (AREA)
- Length Measuring Devices By Optical Means (AREA)
- Image Processing (AREA)
- Length Measuring Devices With Unspecified Measuring Means (AREA)
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Claims (9)
- Système robotisé d'évaluation pour déterminer des données de mesure tridimensionnelles pour la surface d'un objet (12), comprenant :un robot (24) ayant un bras de robot (22) ;un dispositif de commande (38) pour déplacer ledit bras de robot (22) par rapport à la surface de l'objet (12) ;un capteur sans contact (20) disposé sur ledit bras de robot (22) pour recueillir des données d'image représentatives d'une partie de la surface de l'objet (12) ;un dispositif de rapport de position (80) pour rapporter des données de position représentatives de la position dudit capteur sans contact (20) ;un générateur de signal de synchronisation (44) pour générer et transmettre périodiquement un signal de synchronisation, ledit dispositif de rapport de position (80) étant électriquement connecté audit générateur de signal de synchronisation (44) et étant configuré pour rapporter des données de position en réponse à chacun desdits signaux de synchronisation, et ledit capteur sans contact (20) étant électriquement connecté audit générateur de signal de synchronisation (44) et configuré pour recueillir des données d'image en réponse à chacun desdits signaux de synchronisation ;un dispositif de traitement de données (40) adapté pour récupérer des données d'image à partir dudit capteur sans contact (20) et des données de position à partir dudit dispositif de rapport de position (80), et pouvant être utilisé pour synchroniser les données d'image avec les données de position, générant ainsi une représentation tridimensionnelle de l'objet (12) ;ledit dispositif de rapport de position (80) étant configuré comme un système de mesure photogrammétrique qui émet un faisceau de lumière quasi-monochrome, détecte des points lumineux résultant de la réflexion du faisceau de lumière depuis des marqueurs rétroréfléchissants placés sur la surface du capteur sans contact (20), et détecte la position des marqueurs.
- Système robotisé d'évaluation selon la revendication 1, dans lequel ledit bras de robot (22) balaye la surface de l'objet (12), de telle sorte que les données d'image rapportées par ledit capteur sans contact (20) sont ultérieures aux données de position rapportées par ledit dispositif de rapport de position (80).
- Système robotisé d'évaluation selon la revendication 1 ou 2, comprenant en outre un espace de stockage de mémoire (62, 64, 66) pour stocker les données de position dudit dispositif de rapport de position (80), ledit dispositif de traitement de données (40) étant connecté audit espace de stockage de mémoire (62, 64, 66) pour synchroniser les données d'image avec les données de position correspondantes.
- Système robotisé d'évaluation selon l'une quelconque des revendications 1 à 3, dans lequel ledit capteur sans contact (20) est un capteur de lumière bidimensionnel structurel (20).
- Système robotisé d'évaluation selon l'une quelconque des revendications 1 à 4, dans lequel ledit capteur sans contact (20) émet une lumière structurée dans une configuration planaire prédéfinie et ayant un récepteur optique pour recevoir la lumière réfléchie émise par ledit capteur sans contact (20), dans lequel la lumière réfléchie est indicative de la surface de l'objet (12).
- Système robotisé d'évaluation selon l'une quelconque des revendications 1 à 5, dans lequel
ledit dispositif de commande est configuré comme un dispositif de commande de robot (38) pour commander les mouvements dudit bras de robot (22) ;
ledit générateur de signal de synchronisation (44) est électriquement connecté audit dispositif de commande de robot (38) pour générer et transmettre périodiquement ledit signal de synchronisation, ledit dispositif de commande de robot (38) rapportant un ensemble desdites données de position en réponse à chacun desdits signaux de synchronisation, générant ainsi une pluralité d'ensembles de données de position ;
ledit capteur sans contact (20) répond à chacun desdits signaux de synchronisation pour capturer un ensemble de données d'image représentatives d'une partie dudit objet (12), générant ainsi une pluralité correspondante d'ensembles de données d'image représentatives d'une pluralité de parties de l'objet (12) ; et
ledit dispositif de traitement de données est configuré comme un système de vision (40) adapté pour récupérer ladite pluralité d'ensembles de données d'image à partir dudit capteur sans contact (20) et pour synchroniser chaque ensemble de données d'image avec un ensemble de données de position correspondant, générant ainsi une représentation tridimensionnelle de l'objet (12). - Système robotisé d'évaluation selon la revendication 6, comprenant en outre un système de transformation de coordonnée pour transformer chaque ensemble de données de position en une trame de référence de capteur, dans lequel la trame de référence de capteur est associée audit capteur sans contact (20).
- Système robotisé d'évaluation selon la revendication 6 ou 7, dans lequel ledit dispositif de commande de robot (38) est configuré pour rapporter des données de position représentatives de la position dudit bras de robot (22).
- Système robotisé d'évaluation selon la revendication 6 ou 7, dans lequel ledit système de mesure photogrammétrique (80) a un champ d'observation d'étalonnage et peut être positionné à un point d'observation de telle sorte que ledit capteur sans contact (20) soit dans le champ d'étalonnage, et dans lequel ledit système de mesure photogrammétrique (80) se connecte électriquement audit générateur de signal de synchronisation (44) et rapporte un ensemble de données de position en réponse à chacun desdits signaux de synchronisation, générant ainsi une pluralité d'ensembles de données de position.
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
US09/372,871 US6166811A (en) | 1999-08-12 | 1999-08-12 | Robot-based gauging system for determining three-dimensional measurement data |
US372871 | 1999-08-12 |
Publications (3)
Publication Number | Publication Date |
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EP1076221A2 EP1076221A2 (fr) | 2001-02-14 |
EP1076221A3 EP1076221A3 (fr) | 2003-03-26 |
EP1076221B1 true EP1076221B1 (fr) | 2010-04-14 |
Family
ID=23469960
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
EP00117126A Expired - Lifetime EP1076221B1 (fr) | 1999-08-12 | 2000-08-10 | Un robot avec système de jauge pour déterminer des mesures de données à 3 dimensions |
Country Status (5)
Country | Link |
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US (1) | US6166811A (fr) |
EP (1) | EP1076221B1 (fr) |
CA (1) | CA2315508C (fr) |
DE (1) | DE60044170D1 (fr) |
ES (1) | ES2340462T3 (fr) |
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Also Published As
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CA2315508C (fr) | 2008-10-14 |
CA2315508A1 (fr) | 2001-02-12 |
DE60044170D1 (de) | 2010-05-27 |
EP1076221A2 (fr) | 2001-02-14 |
ES2340462T3 (es) | 2010-06-04 |
US6166811A (en) | 2000-12-26 |
EP1076221A3 (fr) | 2003-03-26 |
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